I have a '52 327 completely rebuilt. Radiator is like new, fan is fine, 160 thermostat, timing set correctly, reman. waterpump with correct belt tension.
But I'm still overheating. I can idle the engine indefinetly but after a few miles of regular driving the guage goes to 200+ and it boils over. I drove it in a parade over the weekend, it idled along fine (guage reading 160 +or-) but when I drove home just 3 or so miles it boiled over.
When I installed the waterpump I saw the end of the distribution tube but was unsure at the time of its purpose and did not remove and clean it.
The tube appeared to be just that, a tube. It did not look as though it had two sections to allow water to flow to a certain part of the engine first (ie. the back).

Question 1:
If it were marginally blocked would the result be what I'm experiencing?

Question 2:
If I were to remove it completely what would be the result?

Thanks in advance,
Joe